I"m starting to have issues with my truck overheating. Yesterday was the second time I've had trouble within the last month. I noticed yesterday that the fan did not kick in. Is there a fuse somewhere to look at? I've been searching through some of the previous post about the radiator being clogged with oil. I rather check to see if its a fuse issue before pulling the radiator out.

 

Our trucks are not like the 2nd Gen crowd. We don't get oil clogged radiators. Trash may but no oil. Most common issue with an 06 for overheating is low on coolant. Pull the radiator cap and take a look. If it is low the most common area for it to leak is on the passenger side of the block, the heater hose connections below the manifold.

 

So I will not hear the loud hum of a fan like I did on my '01? i'm going to check my fluid in a couple minutes

 

Just how hot is your truck getting??? My fan won't kick in till around 220-230. And yes they will still roar.

 

well i hit 240 yesterday with a full load of wood. thats a 18' dump trailer rounded high with wood. We stopped for a while until it came back down to 210. The fan never kicked on though.

 

Since just about everything engine-related is controlled by the ECM I'd wonder if it needs a reflash?

 

Somebody correct me if I'm wrong but I don't believe there are any electrical components on the fan.

I believe it's a mechanical thermostat/clutch.

 

Sounds like the Fan clutch needs replacing.

 

Your wrong. the fan clutch is controlled by the ECM. It has a clutch that is applied via a signal from the ECM. Like I said, check the coolant level by taking off the radiator cap. I beat it is low.

 

FYI, I've noticed that if my AC is on my clutch fan will engage more often especially at slower speeds. To test your clutch fan get your truck up to temp then try turning the AC on/off while driving around town at 30mph or so. That's the speed I can generally hear the fan the most, then hold that speed and turn the compressor off (leave your vents blowing so that noise is constant)... you fan clutch should disengage within a few seconds and get quieter. Then turn the AC back on and your fan noise should come right back.

If you try it a few times and you never hear a difference between AC on/off... then I'd say you might have a clutch fan issue.

However, at HWY speeds even while towing I haven't really ever noticed my clutch fan engaging... Any my last trip out it was 106 degrees outside for 600+ miles, I didn't see anything higher than 220 degrees.

 

on my '03, I can hear the fan kick on when as the motor approaches 215*. I really only does this when pulling a long grade. With the a/c on, I can hear the fan cycle on and off at low speed, but once over ~35mph, I don't hear it anymore.

 

Coolant wasn't low. It was half way between full and fill. I went ahead and drained the coolant system. I was able to get ~4 gallons out of it. Went to fill the external tank up but the antifreeze is still half full in the tank. I cannot get the system to plumb. Am I being stupid?

 

You need to fill the system through the radiator, not the over flow bottle...... I bet you have a fan clutch that has gone bad......

 

I am having a similar problem with my 03. I have a post on it in this same section. I just cant believe it can be the actual fan problem due to the fact it works fine with the A/C on. It seems there must be a sensor/ecm problem

 

I'm having same problem on my 3500 new fan clutch took thermostat out still does it now if I'm wrong please correct me doesn't tranny getting hot read in temp gauge